气候变化领域集成服务门户(CCPortal): Petrogenesis of two Cretaceous granitoid episodes in the Luk Ulo region, Central Java, Indonesia, and its implication for the tectonic evolution of the easternmost Neo-Tethys

CCPortal

DOI	10.1130/B36781.1
	Petrogenesis of two Cretaceous granitoid episodes in the Luk Ulo region, Central Java, Indonesia, and its implication for the tectonic evolution of the easternmost Neo-Tethys
	Guo, Donghai; Li, Shan; Permana, Haryadi; Lai, Yu-Ming; Setiawan, Iwan
发表日期	2024
ISSN	0016-7606
EISSN	1943-2674
起始页码	136
结束页码	5-6
卷号	136 期号:5-6
英文摘要	The central part of Java, Indonesia, is located on the southern margin of Sundaland, and records the tectonic -magmatic history of the easternmost Neo-Tethys. Elucidating the petrogenesis and its tectonic setting of the Cretaceous Luk Ulo granites in Central Java is key to reconstructing the late subductionaccretion history of the easternmost NeoTethys. This study reports for the first time the zircon U-Pb geochronology, Hf-O isotope, whole -rock major and trace elements, and Sr-Nd isotope geochemistry of two granitoid episodes from Central Java. Zircon U-Pb dating results show that the Luk Ulo granites formed in two Cretaceous episodes at ca. 115 Ma and ca. 70 Ma. These two Cretaceous granitoid episodes contain both calcalkaline with enriched large -ion lithophile elements and light rare earth elements and depleted high field strength elements, exhibiting arc geochemical signatures. The older (ca. 115 Ma) granites show slightly higher ( 87 Sr/ 86 Sr) i values of 0.70772 to 0.70784 and weakly negative e Nd (t) values of - 2.37 to - 1.67, indicating the contribution of ancient crust. However, the scattered zircon e Hf (t) values of + 0.23 to + 11.39 suggest a probable mixture of ancient crustal components and juvenile crustal additions in the magma source. The high zircon 6 18 O values ( + 8.86%o to + 14.24%o) show the possible incorporation of supracrustal components (sediments and fluids) in the magma formation. In contrast, the younger (ca. 70 Ma) granites show low ( 87 Sr/ 86 Sr) i values of 0.70427-0.70442,strong positive e Nd (t) values of + 3.89 to + 4.03, and zircon e Hf (t) values of + 14.04 to + 17.38 and slightly higher zircon 6 18 O values of + 5.01%o to + 6.49%o than the depleted mantle, indicating that the magma was predominantly derived from the juvenile crust with negligible supracrustal involvement. In general, zircon e Hf (t) values and whole -rock e Nd (t) values of the Late Cretaceous (after ca. 90 Ma) granitic rocks in the southwest margin of Sundaland were higher than those of the Early Cretaceous granitoids, suggesting a change in the source region from ancient to the juvenile in response to the rollback of the Neo-Tethys ocean. Our findings from the two Cretaceous granitoid episodes in Central Java provide new insights into the tectonomagmatic evolution along the southwestern margin of Sundaland and the two different episodes of crustal growth in the easternmost Tethys during the Cretaceous.
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001235332700003
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306350
作者单位	Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; National Taiwan Normal University
推荐引用方式 GB/T 7714	Guo, Donghai,Li, Shan,Permana, Haryadi,et al. Petrogenesis of two Cretaceous granitoid episodes in the Luk Ulo region, Central Java, Indonesia, and its implication for the tectonic evolution of the easternmost Neo-Tethys[J],2024,136(5-6).
APA	Guo, Donghai,Li, Shan,Permana, Haryadi,Lai, Yu-Ming,&Setiawan, Iwan.(2024).Petrogenesis of two Cretaceous granitoid episodes in the Luk Ulo region, Central Java, Indonesia, and its implication for the tectonic evolution of the easternmost Neo-Tethys.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(5-6).
MLA	Guo, Donghai,et al."Petrogenesis of two Cretaceous granitoid episodes in the Luk Ulo region, Central Java, Indonesia, and its implication for the tectonic evolution of the easternmost Neo-Tethys".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.5-6(2024).